(1) Meteorology Today by C. Donald Ahrens,
____
Brooks Cole, 2002
(2) Universe by R.A. Freedman, W.J. Kaufman,
____
W.H. Freeman Publications
(3) http://neo.jpl.nasa.gov/neo/
See Diane Huot, YNHTI 2005
See Roberta Mazzucco, YNHTI 2005
See Waltrina Kirkland Mullins, YNHTI 2005